So why is it so important? Well, this new species is thought to be a forerunner of the much smaller chaetognaths swimming around in today’s oceans.

These little guys make up a large portion of the world’s plankton – making them a pretty big deal in the food chain.

But the amount of spines are also completely different to today’s chaetognaths – C. praetermissus’s 50 spines are nearly double the maximum number that current chaetognaths use to catch their prey.

The other cool thing about this research is the fossils themselves. The team had to use over 50 specimens to come to a conclusion about the species, because fossils of the worms’ squishy bodies are extremely rare finds.

J.B. Caron/Royal Ontario Museum

“The [fossilised] specimens preserve evidence of features such as the gut and muscles, which normally decay away, as well as the more decay-resistant grasping spines,” says Briggs.

“They show that chaetognath predators evolved during the explosion of marine diversity during the Cambrian Period, and were an important component of some of the earliest marine ecosystems.”

So there you go – even if you look like a butt with claws, you can totally still be important in the history of Earth.